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Fix Cloudflare 521 Error: DNS Configuration Problem - How to Set Up a Git Merge Conflict Resolution Tool-Windows Security App Not Opening Access Denied

Updated 2026-07-28 08:41:52browser-issues
Fix Cloudflare 521 Error: DNS Configuration Problem - How to Set Up a Git Merge Conflict Resolution Tool-Windows Security App Not Opening Access Denied
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.